Release to Nextcloud App Store

[sunjam]

Hi @alboro, thanks for your great software!

• Looks like FractalNote would be a great addition to the Nextcloud app store. Here is the documentation.
• Here is the link for submitting your app. Adding your app to the store could also help with exposure and get others to help maintain it through minor version releases, etc. The process does not look too painful. 👍

@jancborchardt might be able to offer quick advice.